21213310100 has 18 divisors (see below), whose sum is σ = 46032883134. Its totient is φ = 8485324000.

The previous prime is 21213310061. The next prime is 21213310177. The reversal of 21213310100 is 101331212.

It can be written as a sum of positive squares in 3 ways, for example, as 4048144 + 21209261956 = 2012^2 + 145634^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106066451 + ... + 106066650.

Almost surely, 2^21213310100 is an apocalyptic number.

21213310100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213310100 is an abundant number, since it is smaller than the sum of its proper divisors (24819573034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213310100 is a wasteful number, since it uses less digits than its factorization.

21213310100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212133115 (or 212133108 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21213310100 its reverse (101331212), we get a palindrome (21314641312).

The spelling of 21213310100 in words is "twenty-one billion, two hundred thirteen million, three hundred ten thousand, one hundred".